function drawVisualization() {
  var data = google.visualization.arrayToDataTable([
    ['Director (Year)',  'Rotten Tomatoes', 'IMDB'],
    ['Alfred Hitchcock (1935)', 8.4,         7.9],
    ['Ralph Thomas (1959)',     6.9,         6.5],
    ['Don Sharp (1978)',        6.5,         6.4],
    ['James Hawes (2008)',      4.4,         6.2]
  ]);

  var options = {
    width: 600, height: 400,
    title: 'The decline of \'The 39 Steps\'',
    vAxis: {title: 'Accumulated Rating'},
    isStacked: true
  };

  var chart = new google.visualization.SteppedAreaChart(document.getElementById('visualization'));
  chart.draw(data, options);
}
